Multisite Privacy Enhancements

Hello, I was wondering if it would be possible to disallow access to the uploads folder if the user is unauthorized to view the site? Currently if they have a link to a file in the uploads folder they can still view the file. Another suggestion would be to allow us to override the default Access Denied page with a custom page. We would like to somehow integrate that page with our current theme and be able to change the wording.

Thanks,
Josh

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